function toggle_field_on(id) {
   var e = document.getElementById(id);
   if(e.style.display == 'none')
	  e.style.display = 'block';
}
function toggle_field_off(id) {
   var e = document.getElementById(id);
   if(e.style.display == 'block')
	  e.style.display = 'none';
}
function toggle_vis(id) {
   var e = document.getElementById(id);
   if(e.style.display == 'block')
	  e.style.display = 'none';
	  //document.theform.checkform.value == 'N';
   else
	  e.style.display = 'block';
	  //document.theform.checkform.value == 'Y';
}